Windsurfing boom clamp on device



FIG. 1 is an isometric view of a windsurfing boom clamp on device showing my new design;

FIG. 2 is a front view thereof and

FIG. 3 is a right side view thereof.

FIG. 4 is a left side view thereof.

FIG. 5 is a back view thereof; and,

FIG. 6 is top view thereof. 

The ornamental design for a windsurfing boom clamp on device, as shown. 